Inside Indiana Business -- Renowned for hearty, oversized portions and piping hot subs, Firehouse Subs announces plans for extensive expansion in Indianapolis, with the first store opening at the end of summer and eventually a total of 28 restaurants. With more than 360 locations, the chain is famous for premium meats and cheeses piled high atop toasted sub rolls served “Fully Involved®” with fresh produce. The authentic firehouse setting is based on the founders’ 200 years of firefighting heritage.